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11.
Peter Schelkens Touradj Ebrahimi Antonin Gilles Patrick Gioia Kwan‐Jung Oh Fernando Pereira Cristian Perra Antonio M. G. Pinheiro 《ETRI Journal》2019,41(1):93-108
Guaranteeing interoperability between devices and applications is the core role of standards organizations. Since its first JPEG standard in 1992, the Joint Photographic Experts Group (JPEG) has published several image coding standards that have been successful in a plethora of imaging markets. Recently, these markets have become subject to potentially disruptive innovations owing to the rise of new imaging modalities such as light fields, point clouds, and holography. These so‐called plenoptic modalities hold the promise of facilitating a more efficient and complete representation of 3D scenes when compared to classic 2D modalities. However, due to the heterogeneity of plenoptic products that will hit the market, serious interoperability concerns have arisen. In this paper, we particularly focus on the holographic modality and outline how the JPEG committee has addressed these tremendous challenges. We discuss the main use cases and provide a preliminary list of requirements. In addition, based on the discussion of real‐valued and complex data representations, we elaborate on potential coding technologies that range from approaches utilizing classical 2D coding technologies to holographic content‐aware coding solutions. Finally, we address the problem of visual quality assessment of holographic data covering both visual quality metrics and subjective assessment methodologies. 相似文献
12.
Sergio Gerardo de-los-Cobos-Silva Roman Anselmo Mora-Gutiérrez Miguel Angel Gutiérrez-Andrade Eric Alfredo Rincón-García Antonin Ponsich Pedro Lara-Velázquez 《Artificial Intelligence Review》2018,49(2):245-279
Many real-world problems can be seen as constrained nonlinear optimization problems (CNOP). These problems are relevant because they frequently appear in many industry and science fields, promoting, in the last decades, the design and development of many algorithms for solving CNOP. In this paper, seven hybrids techniques, based on particle swarm optimization, the method of musical composition and differential evolution, as well as a new fitness function formulation used to guide the search, are presented. In order to prove the performance of these techniques, twenty-four benchmark CNOP were used. The experimental results showed that the proposed hybrid techniques are competitive, since their behavior is similar to that observed for several methods reported in the specialized literature. More remarkably, new best known are identified for some test instances. 相似文献
13.
Frankova J Kubala L Velebny V Ciz M Lojek A 《Journal of materials science. Materials in medicine》2006,17(10):891-898
Hyiodine (high molecular weight hyaluronan combined with KI3 complex) is a new non-adhesive wound dressing which significantly improves the healing process. The aim of the study was
to investigate the effects of Hyoidine on functional properties of isolated human keratinocytes and leukocytes, and on those
of U937 and HL60 cell lines. While KI3 complex inhibited the viability and proliferation of the cells tested, Hyiodine did not have any significant effect. The
expression of CD11b, CD62L and CD69 on PMNL, monocytes and lymphocytes, as well as the oxidative burst of blood neutrophils,
were not changed. On the contrary, Hyiodine inhibited the PMA-activated oxidative burst and significantly increased the production
of IL-6 and TNF-α by lymphocytes. It was concluded that hyaluronan content of Hyiodine reduces the toxic effect of KI3 complex on cells and speeds up the wound healing process by increasing the production of inflammatory cytokines. 相似文献
14.
Three-dimensional microstructural changes in the Ni–YSZ solid oxide fuel cell anode during operation
George J. Nelson Kyle N. Grew John R. Izzo Jeffrey J. Lombardo William M. Harris Antonin Faes Aïcha Hessler-Wyser Jan Van herle Steve Wang Yong S. Chu Anil V. Virkar Wilson K.S. Chiu 《Acta Materialia》2012,60(8):3491-3500
Microstructural evolution in solid oxide fuel cell (SOFC) cermet anodes has been investigated using X-ray nanotomography along with differential absorption imaging. SOFC anode supports composed of Ni and yttria-stabilized zirconia (YSZ) were subjected to extended operation and selected regions were imaged using a transmission X-ray microscope. X-ray nanotomography provides unique insight into microstructure changes of all three phases (Ni, YSZ, pore) in three spatial dimensions, and its relation to performance degradation. Statistically significant 3D microstructural changes were observed in the anode Ni phase over a range of operational times, including phase size growth and changes in connectivity, interfacial contact area and contiguous triple-phase boundary length. These observations support microstructural evolution correlated to SOFC performance. We find that Ni coarsening is driven by particle curvature as indicated by the dihedral angles between the Ni, YSZ and pore phases, and hypothesize that growth occurs primarily by means of diffusion and particle agglomeration constrained by a pinning mechanism related to the YSZ phase. The decrease in Ni phase size after extended periods of time may be the result of a second process connected to a mobility-induced decrease in the YSZ phase size or non-uniform curvature resulting in a net decrease in Ni phase size. 相似文献
15.
Antonin Faes Zacharie WuilleminPietro Tanasini Nicola AccardoStefano Modena Hans J. SchindlerMarco Cantoni Henning Lübbe Stefan DiethelmAïcha Hessler-Wyser Jan Van herle 《Journal of power sources》2011,196(21):8909-8917
One of the major limitations of the nickel (Ni) - yttria-stabilized zirconia (YSZ) anode support for solid oxide fuel cells (SOFC) is its low capability to withstand transients between reducing and oxidizing atmospheres (“RedOx” cycle), owing to the Ni-to-NiO volume expansion. This work presents results on different anode supports fabricated by tape casting. Three compositions are prepared, as the outcome of a preceding design of experiment approach. The NiO proportion is 40, 50 and 60 wt% of the anode composite.The anode support characteristics like shrinkage during sintering, in-situ conductivity at high temperature, electrochemical performance and tolerance against RedOx cycles have been measured. Performance up to 0.72 W cm−2 (0.62 V, 800 °C) is recorded for the 60 wt% NiO sample on small cells. The open circuit voltage is maintained within ±5 mV after 10 full RedOx cycles at 800 °C and one at 850 °C. Performances tend to be stabilized after one or multiple RedOx cycles. The microstructural observations show round Ni particles after the first reduction; after a RedOx cycle, the Ni particles include micro-porosities that are stable under humidified reducing atmosphere for more than 300 h. 相似文献
16.
Tariq Mansoor Hafiz Faisal Siddique Azam Ali Petra Komarkova Antonin Havelka Zahid Hussain 《纺织学会志》2018,109(3):307-311
Wrinkle free fabric at low cost is always a desirable aesthetic property. Different type of resins/finishes and pre-heat setting prior to processing are applied to avoid wrinkles in woven and hosiery, respectively. Current study is proposed to produce wrinkle free circular plaited knitted fabric by the elimination of a pre-boarding step. In this achievement, yarn covering parameters and compatibility of yarns with knitting machines are examined. Sock samples were analyzed for improved physical appearance (wrinkles) after various processes (pre-tumbling, dyeing, bleaching, and washing). Yarn specifications (sheath yarn fineness, sheath yarn texture i.e. shrink/un-shrink, covering air-knots) impact on socks physical appearance were also analyzed. The results clearly showed that by decreasing number of yarn covering air knots and sheath yarn fineness leads to prevention of wrinkle formation. The results also prove to be supportive for cost effectiveness by eliminating the pre-setting stage. 相似文献
17.
Janine Pfetzing-Micklich Christoph Somsen Antonin Dlouhy Christoph Begau Alexander Hartmaier Martin F.-X. Wagner Gunther Eggeler 《Acta Materialia》2013,61(2):602-616
We use a nanoindenter with a Berkovich tip to study local mechanical properties of two polycrystalline intermetallics with a B2 crystal structure, NiAl and NiTi. We use orientation imaging scanning electron microscopy to select a relevant number of grains with appropriate sizes and surface normals parallel to 〈0 0 1〉, 〈1 0 1〉 and 〈1 1 1〉. As a striking new result, we find a strong crystallographic orientation dependence for NiTi. This anisotropy is less pronounced in the case of NiAl. For NiTi, the indentation force required to impose a specific indentation depth is highest for indentation experiments performed in the 〈0 0 1〉 direction and lowest along the 〈1 1 1〉 direction. We consider transmission electron microscopy results from cross-sections below the indents and use molecular dynamics simulations and resolved shear stress calculations to discuss how this difference can be accounted for in terms of elementary deformation and transformation processes, related to dislocation plasticity (NiAl and NiTi), and in terms of the stress-induced formation and growth of martensite (NiTi). Our results show that the crystallographic anisotropy during nanoindentation of NiTi is governed by the orientation dependence of the martensitic transformation; dislocation plasticity appears to be less important. 相似文献
18.
Lucie Kolatorova Karolina Adamcova Jana Vitku Lenka Horackova Marketa Simkova Marketa Hornova Michala Vosatkova Veronika Vaisova Antonin Parizek Michaela Duskova 《International journal of molecular sciences》2022,23(18)
The fast-track process to approve vaccines against COVID-19 has raised questions about their safety, especially in relation to fertility. Over the last 2 years, studies have appeared monitoring female fertility, especially from assisted reproduction centers or in animal experiments. However, studies monitoring healthy populations are still limited. The aim of our study was to monitor the relevant parameters of female fertility (sex and other steroids, LH, FSH, SHBG, Antimüllerian hormone and antral follicle count) before and then 2–4 months after the third dose of vaccination against COVID-19 in a group of 25 healthy fertile woman. In addition, anti-SARS-CoV-2 and anti-SARS-CoV-2S antibodies were determined. We did not observe significant changes in the measured parameters before and after the third dose of vaccination. By comparing levels of the analytes with antibodies indicating a prior COVID-19 infection, we found that women who had experienced the disease had statistically lower levels of estrone, estradiol, SHBG and 5α-dihydroprogesterone, and conversely, higher levels of androgen active dehydroepiandrosterone and dihydrotestosterone. Our results confirm that vaccination does not affect female fertility, and that what fertile women should be worried about is not vaccination, but rather COVID-19 infection itself. 相似文献
19.
20.
Oriol Marc Martínez-Fernández Silverio Behutiye Woubshet Farré Carles Kozik Rafał Seppänen Pertti Vollmer Anna Maria Rodríguez Pilar Franch Xavier Aaramaa Sanja Abhervé Antonin Choraś Michał Partanen Jari 《Software Quality Journal》2020,28(3):931-963
Software Quality Journal - Quality requirements (QRs) are a key artifact needed to ensure the quality and success of a software system. Despite their importance, QRs rarely get the same degree of... 相似文献